Muffler



H. M. PATCH.

MUFFLER.

' APPLICATION FILED JUNE 19, 1919.

1,357,079. Patented Oct. 26,1920

INVENTOR l I 7 fim zvi/ mw EgY ATTGRNEY UNITED STATES PATENT OFFICE.

HARRY M. PATCH, OF SEATTLE, WASHINGTON.

MUFFLER.

Application filed June 19,

To all whomit may concern:

Be it known that I, HARRY M. PATCH, a citizen of the United States, residing at Seattle, in the county of King and State of \Vashington, have invented certain new and useful Improvements in Muffiers, of which the following is a specification.

This invention relates to mufflers for the exhaust gases of internal combustion engines such as are used, more especially, on automobiles and other power driven vehicles.

The object of my invention is the provision of a mufiler which will serve to silently discharge the engine exhaust gases and with substantially no back pressure to lessen the efficiency of the engine.

A further object of the invention is to provide a mufller in which is employed a plurality of unobstructed channels through which the as travels in such a manner as to maintain t e interior of the muffler practi cally free from carbon deposits.

With the above and other objects in view, the invention consists in the novel construction, arrangement and combination of parts as will be hereinafter described and claimed.

In the accompanying drawings, wherein like reference characters designate corresponding parts in all the views, Figure 1 is a horizontal longitudinal section of a muffler embodying my invention in the form now preferred by me. Fig. 2 is an end elevational view of the same. Fig. 3 is a view partly in plan and partly in longitudinal section showing a modified form of the muffier structure.

In said drawings, and referring first to Figs. 1 and 2, the numeral 5represents a shell or casing which is, by preference, substantially of a pear shape in horizontal section and is provided at one end with an inlet opening 6 which in practice communicates with the exhaust, pipe leading from an explosion engine.

At its opposite end, the casing is provided with an gutlet openin -7 arranged in axial alinement with the in et 0 ening and also with the majoraxis w-ar o the casing.

The interior of the casing is rovided with a plurality of partitions a, i 0, etc., disposed in similarly arranged roups, as shown in Fig. 1, at opposite si es of the axis ww to afford a receiving chamber 8 adjacent to said inlet and a central dis-' charge passage 9 extending from said out- Specification of Letters Patent.

Patented Oct. 26, 1920.

1919. Serial No. 305,295.

I let to within a short distance of the receiving chamber. The partitions of each of sa1d groups extend outwardly from the receiving chamber 8 into proximity of the minor axis y-yof the casing near which the inner partitions a, a terminate. The other partitions Z), 0, etc., continue in curved portions as 71 0 etc., and terminate in inwardly directed straight portions 6 0 etc., which extend to the discharge passage 9, substantially as shown. In order to insure that a proper proportion of the gas will pass through the outer or longer channels, such as k and Z, one or more of the partitions of such series are advantageously protruded, into the receiving chamber to afford directing elements 8. By such configuration and arrangement of the partitions is provided a central flaring channel a connecting the receiving chamber 8 with-the discharge passage 9 and a series of curviform channels Z), 0, Z of progressively greater lengths.

The exhaust from an engine enters the receiving chamber 8 in rapidly recurring impulses and thence encountering the partitions is divided into a series of streams which travel through the various aforesaid channels. These streams, however, are

caused to travel different distances, at dif-' ferent speeds and under different degrees of expansion before reachmg the discharge assa 'e 9 wherein the streams successivel 'at the receiving chamber 8, as at 11, and to the rear thereof is spaced to afford a cavity 12 between the respective plate elements and which opens into the passage 9. Provided in the upper and lower walls of the casing (Fig. 3) are perforations 14 opening into the; wall cavities 12 for supplying cooling air into the latter whence it escapes in confluence with the branch streamsinto the main passage 9.

It is to be noted that in the present invention the channels through which the exhaust gases pass contain no baffling devices nor return bends but conduct such gases unobstructedly from the inlet to a discharge passage.

What ll claim, is

1. A muffler comprising a casing having inlet and outlet openings at its opposite ends, series of curviform partitions provided within the casing to divide the same into a receiving chamber at the inlet end and a discharge passage arranged axially of the casing and coextensive with the outlet opening, said partitions also affording channels whereby gas is conducted successively in divergent and confluent streams in traveling from said chamber to said discharge passage.

2. A muffler comprising a casing having inlet and outlet openings at its opposite ends, a plurality of partitions provided in the casing between said openings and affording a central passage and unobstructed channels of different lengths, for the flow of gas from said inlet into said passage, said channels communicating through their respective discharge ends with said passage at different distances from said inlet, thereby eliminating the impulses from the exhaust gases and delivering the same in a substantially continuous stream from the muffler outlet.

3. A muffler comprising a casing of substantially a pear shape in transverse section.

and having an inlet at its oblate end and an outlet at its prolate end, said casing being provided interiorly with series of partitions arranged to afford curviform channels of greater lengths grogressively from the major axis of the mu er toward the outer sidesof the latter, said partitions being furthermore arranged to afford a receiving chamber adjacent to said inlet and a discharge passage common to all of said channels and communicating with said outlet.

1. A muffler comprising a casing having axially alined inlet and outlet openings at its opposite ends and a discharge passage coextensive with said outlet opening and extending from the latter to within a short distance of the inlet opening, series of partitions arranged in two groups respectively at opposite sides of said passage and affording channels of different len hs in each of said groups between the mu er inlet and said passage whereby the gas is transmitted in a plurality of streams and delivered into said passage at different distances from said inlet to eliminate gas impulses into a substantially continuous stream.

5. A mufiler comprising a casing having axially disposed inlet and outlet openings at opposite ends thereof, and a discharge passage coextensive with said outlet opening and extending from the latter to within a short distance of the inlet opening, and a series of partitions dividing the interior of the casing into a plurality of curviform channels whereby the gas is compelled to travel in a plurality of divergent and confluent streams in traveling between said inlet opening and said passage and at different distances in the latter from said inlet opening to eliminate gas impulses into a substantially continuous stream.

6. A muffler comprising a casing having gas inlet and outlet openings at its opposite ends and a plurality of hollow partitions disposed between said openings to provide a central passage which communicates with the outlet opening and a plurality of channels of different lengths making communication between said inlet opening and said passage, said casing being provided in a Wall thereof with perforations whereby air is admitted from the external atmosphere into the spaces with the respective hollow partitions.

Signed at Seattle, Washington, this 14th day of June, 1919.

HARRY M. PATCH. Witnesses PIERRE BARNES, ELIZABETH JOHNSON. 

